General > General Technical Chat
Reverse Polarity
(1/1)
mrpenguin:
Has anybody ever encountered a battery charger with its output polarity reversed?
Was given a 42V LIPO battery charger which went 'POP' when plugged into the battery before it was connected to the mains.
Owner had changed the supplied anderson plug to a different type with a lead attached has connected Red to Red and Black to Black (logically).
Battery would not charge.
I measured 10V DC output not 42V so definitely faulty.
However when I took apart the newly fitted plug and measured again with black probe to black and red to red I got a negative reading.
Reversing the probed to black on red and red on black gave a positive reading.
I took the charger apart and the red wire was connected to the PCB with the silk screen label showing + and the black was labelled -, so connected correctly apparently.
Either the PCB is mislabelled or the output polarity has been reversed somehow.
The supplier insists the charger was tested before it was supplied.
In all my 40 years of repairs I have never encountered anything like this..
Even if the battery was connected in reverse as has happened to many of the chargers I have repaired I have never seen this.
Any thoughts?
Vovk_Z:
Not all battery chargers have reverse polarity protection.
Navigation
[0] Message Index
Go to full version